Mathematics, 10.12.2019 02:31 BrainlyBoi
The average of iq test scores of 31 seventh-grade girls in midwest school district is 89. iq scores follow a normal distribution with standard deviation 15. treat these 31 girls as an srs of all seventh-grade girls in this district. iq scores in a board population are supposed to have mean 100. is there evidence that the mean in this district differs from 100?
Answers: 3
we see that 
so we can conclude that we can reject the null hypothesis, and the the actual true mean is significantly different from 100. 
represent the mean of seventh-grade girls in Midwest school district
represent the standard deviation for the sample 
sample size 
represent the value that we want to test 
represent the significance level for the hypothesis test. 
represent the p value for the test (variable of interest) 
(1) 
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The average of iq test scores of 31 seventh-grade girls in midwest school district is 89. iq scores...
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